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| OYS | Ocean Yacht Systems | |
| OYS | OYSter | |
| OYS | Office of Youth Services | |
| OYS | Oregon Youth Summit | |
| OYS | Ohio Youth Symphony | |
| OYS | Ohio Youth Sailing | |
| OYS | Ohio Youth Sailing | |
| OYS | Omnipotent Youth Society | |
| OYS | Ontario Youth Sports | |
| OYS | Orinda Youth Sports | |
| ÖYS | Ögrenci Yerlestirme Sinavi | |
| OYS | Outstanding Young Scientist | |
| OYS | Oulun Yliopistollinen Sairaala | |
| OYS | Own Your Story | |
| OYS | Oakville Yacht Squadron | |
| OYS | Ontario Youth Sports | |
| OYS | Omnipotent Youth Society | |
| OYS | Operation Youth Success | |
| OYS | Older Youth Services | |
| OYS | Orinda Youth Sports | |
| OYS | Ohio Youth Sailing | |
| OYSA | Oregon Youth Soccer Association | |
| OYSA | Onalaska Youth Sports Association | |
| OYSA | Olympic Youth Soccer Association | |
| OYSA | Oxford Youth Soccer Association |
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